There are some differences on setting up RRDReST on CentOS 8, Almalinux 9 vs CentOS 7

If you are setting this up to use with LibreNMS and Grafana, check out the rest of the this article. https://www.incredigeek.com/home/setting-up-grafana-on-librenms/

Installing RRDReST

All the docker commands have been swapped out for podman.

1. Install Docker
2. Create a compose file
3. Run compose file to create container

Install docker

Podman is default on CentOS 8 and later and is for the most part a drop in replacement for Docker.

sudo yum install -y podman podman-compose
sudo systemctl enable podman

Create podman-compose file

Create docker compose file with the following options

vi podman-compose.yml

Change the TZ to your time zone. If you have issues with the graphs, most likely something is off with the time zone between this container and Grafana/LibreNMS server

version: "3.5"

services:

  rrdrest:
    image: michaelwadman/rrdrest:latest
    container_name: rrdrest
    restart: always
    volumes:
      - "/opt/librenms/rrd:/opt/librenms/rrd:Z"
    environment:
      - TZ=America/Denver

Note that the :Z is needed for SELinux to allow RRDReST to access the sub folders. AKA. the rrd files.

Run RRDReST Container

Save the file and start and setup the container with

sudo podman-compose up -d

You will need your docker container IP address to setup the connection in Grafana

sudo docker exec -it rrdrest ip addr | grep eth0

Configure RRDRest to start on system boot with systemd

The “restart: always” option does not appear to work on systems with podman. We can create a systemd service instead.

Use the following command to automatically create a

podman generate systemd rrdrest

Copy the contents to a new file in

/etc/systemd/system/rrdrest.service

Enable the new service with

systemctl enable rrdrest

Congratulations. RRDReST is now setup and running.